Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a795d56ada77f4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-19 23:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ff35c4f3b8a235f653fcbd7671ba590 SHA-1: 1e8d2cf2c3d90cbf88abc8deae4b0f6919d02ef6 SHA-256: 61a795d56ada77f41a39296019de90fe821d7720c22e6c947c7de2bd0f560e36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=formation+en+ligne+agent+immobilier+belgique', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to online real estate agent training. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=formation+en+ligne+agent+immobilier+belgique
    • http://files.thewellmadison.com/uploads/1/3/1/3/131383426/sozuwefegobuliduzebi.pdf
    • http://files.albertateamsortingassociation.com/uploads/1/3/1/6/131606393/8c39e.pdf
    • http://guxoneme.aaupusa.com/uploads/1/3/1/0/131070581/padorelikik_kepivofupov_susowul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9663/6580/files/66586708249.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/vasojijoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunizededalusabunis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/93945806896.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/29818768113.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/gifaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/vejudogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0308/files/zumdahl_chemistry_9th.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/sweet_potato_pie_story.pdf
    • https://cdn.shopify.com/s/files/1/0449/4403/1899/files/concepto_de_aprendizaje_autonomo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006177.bin
a10486dad18fde17ac7e1ec1ce19d06523dbb843ccc7f8addf898b1685ccf93e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 5048 bytes
font_01_sfnt_off00007288.bin
53804c7be366bcec87c5fff59b01eb3c67197a6a5d1579b11c32c66b54445fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7288 11840 bytes